win32: window moves unexpectedly during manual resize to taller-than-screen

[avih]

mpv master, own build, 0.33.0-102-g5824d9fff8
Windows 10 20H2.

Reproduction steps

• Open mpv with a video roughly the same height as the the display but narrow enough such that resizing would be limited by the height. E.g. on a 1080p display this would do: mpv --no-config av://lavfi:testsrc=size=1000x1000
• Drag the window down such that roughly only the top half remains visible on screen.
• Resize the window upward from the window top edge or one of the top corners, and try to make it taller than the screen height would allow (should be reached quickly because the height is near or at the maximum already).

Expected behavior

The window should not grow bigger at some stage, and remain in place.

Actual behavior

Once the maximum allowed height is reached, the window starts moving very rapidly upwards until it goes out of the display (it does come back into the display when releasing the mouse button which was held down during the resize)..

Log file

https://0x0.st/-TR3.txt

[na-na-hi]

Is this fixed for you by #16127? I cannot reproduce anymore.

[Jules-A]

I can still reproduce with window-maximized, snap-window and no-border after entering fullscreen, exiting then trying to resize. Nowhere to the extent of OP though but it shouldn't be exceeding it.

[avih]

Is this fixed for you by #16127? I cannot reproduce anymore.

Still happens to me with v0.41.0-dev-ge96c8ed65 from today, same steps to reproduce:

mpv --no-config av://lavfi:testsrc=size=1000x1000

then move the window down, then resize it.

But I think missing from the initial description is how to resize.

There's no issue if I resize-drag the top border upwards. In this case, at some stage the window size doesn't change anymore - and the window doesn't move.

But if I drag one of the top corners of the mpv window towards the respective corner of the screen (e.g. resize-drag the top-right window corner towards to the top-right corner of the screen), then as soon as it reaches the max possible window height, the whole window starts moving up rapidly.

That window movement is tied to the mouse drag movement - maybe 10px (or title-bar-height?) window movement up for every 1px top-right-corner-drag towards the top-rigth, which is visible if I drag-resize it VERY slowly.

@na-na-hi @kasper93 can you reproduce it with this description?